Visions of Mana

Once you receive your first elemental vessel, you'll learn about the elemental plots after equipping it to your character. This process changes your class, and gives you essentially a skill tree to learn new abilities and passive bonuses. You need elemental points for this, which you can earn by harvesting elementite, or by finding/earning golden clovers (be sure to pick up every yellow sparkle you see in the world for more golden clovers). Purchase any skill from the elemental plot to unlock this achievement.